Malicious PDF — malware analysis report

Static analysis result for SHA-256 37512f4076e8ec6a…

MALICIOUS

PDF

93.5 KB Created: 2021-07-13 20:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9f83670fadbf6013dc85de30f345f8ff SHA-1: 83e10d1b72930c012728da9d1ed5a170bc8ab643 SHA-256: 37512f4076e8ec6a9bb1e523fd5a0e1482ccb14be70013552a2e3e3831529af3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress uploads and other disposable hosting sites. These links likely serve to redirect users to phishing pages or download further malicious payloads, indicating a multi-stage attack. No scripts were extracted, but the structure and URL patterns are strongly indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crysiq.ru/uplcv?utm_term=kevin+durant+james+harden+russell+westbrook PDF link annotation
    • http://solyaris.pro/admin/ckfinder/userfiles/files/51403977249.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/rezuv.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/bonutukidujedobipuwatex.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a1cb13c44---50976893892.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/buzagisiwepiribuwun.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/rufafemepageroj.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/0cb5c710fdcaae97168165bfd6160963/gonutitilemelemakuf.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/41829153523.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/tipegolasi.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/c3385e2a99e65d5261669f37067aa8ad/zulogibuwuvagu.pdfIn PDF document text
    • https://digireg.org/upload/99213621124.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e4f31c7c5---mopex.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/df09ef2272de6f6850e5120622727bc3/purutaziletubivulubo.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/gbivoojtsctlat67gdrsbi28ra/96545113324.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/52330101973.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/76d988b0ff796ba8066d9d5f1cf77ba0/tubejagejuzogajib.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/41993628839.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071a746b816f---kizeragub.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925835f31a6---nobawi.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/69660061310.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/kesevujekex.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753ffb5b788---posakijinowasubuvepik.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/o6lgv53eb4jsioap0alttnjs02/tiweborirokopenuvasu.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/k284ndbct396uo7gmnlb6gpldp/lexisujojatabarub.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/91327922993.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B1 17504 bytes
SHA-256: 00074c6889b4394c2fcf568ba6acf470caa0b4de157faad64ef8abc5b9b6fa92
font_01_sfnt_off0001347d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C94 11116 bytes
SHA-256: 800c834ea678146e0bbee02b32ac8f9fddf18b34dc3e50dca1754cc26a36e8b7

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